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Walmart 's first-quarter margins were pressured by increased transportation costs.
The trucking industry is getting squeezed by higher wages, driven by a shortage of drivers.
The retailer also said higher fuel prices were pinching margins.
Walmart said in its earnings call it will be vigilant about those cost increases.
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Walmart 's first-quarter earnings topped Wall Street estimates, but the retailer was unable to avoid the sting of a crisis that's hurting several industries: rising transportation costs.
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